A man who prosecutors accuse of "recklessly infecting" two male sex partners with HIV in Missouri is on trial in a case that some activists say highlights outdated laws.

Twenty-three-year-old Michael L. Johnson faces felony HIV exposure charges. He also is accused of knowingly exposing four others to the virus that causes AIDS over nearly 10 months after being diagnosed as HIV positive in January 2013.

He has pleaded not guilty. His trial began Monday with jury selection.

The encounters occurred in Johnson's dorm room and other campus housing at Lindenwood University, a private school in the St. Louis suburb of St. Charles. Johnson of Indianapolis was a wrestler at Lindenwood.

Some legal reform groups say such laws in Missouri and more than 30 other states criminalize a medical condition.